Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/unlink.c |
| 3 | * |
| 4 | * nfs sillydelete handling |
| 5 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/slab.h> |
| 9 | #include <linux/string.h> |
| 10 | #include <linux/dcache.h> |
| 11 | #include <linux/sunrpc/sched.h> |
| 12 | #include <linux/sunrpc/clnt.h> |
| 13 | #include <linux/nfs_fs.h> |
Linus Torvalds | b35e704 | 2007-10-19 19:59:18 -0700 | [diff] [blame] | 14 | #include <linux/sched.h> |
| 15 | #include <linux/wait.h> |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 16 | #include <linux/namei.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
Steve Dickson | ef818a2 | 2007-11-08 04:05:04 -0500 | [diff] [blame] | 18 | #include "internal.h" |
Andy Adamson | 472cfbd | 2009-04-01 09:22:24 -0400 | [diff] [blame] | 19 | #include "nfs4_fs.h" |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 20 | #include "iostat.h" |
| 21 | #include "delegation.h" |
Steve Dickson | ef818a2 | 2007-11-08 04:05:04 -0500 | [diff] [blame] | 22 | |
Trond Myklebust | 70ded20 | 2013-08-21 12:08:45 -0400 | [diff] [blame] | 23 | #include "nfstrace.h" |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | /** |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 26 | * nfs_free_unlinkdata - release data from a sillydelete operation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | * @data: pointer to unlink structure. |
| 28 | */ |
| 29 | static void |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 30 | nfs_free_unlinkdata(struct nfs_unlinkdata *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | { |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 32 | iput(data->dir); |
| 33 | put_rpccred(data->cred); |
| 34 | kfree(data->args.name.name); |
| 35 | kfree(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | #define NAME_ALLOC_LEN(len) ((len+16) & ~15) |
| 39 | /** |
| 40 | * nfs_copy_dname - copy dentry name to data structure |
| 41 | * @dentry: pointer to dentry |
| 42 | * @data: nfs_unlinkdata |
| 43 | */ |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 44 | static int nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
| 46 | char *str; |
| 47 | int len = dentry->d_name.len; |
| 48 | |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 49 | str = kmemdup(dentry->d_name.name, NAME_ALLOC_LEN(len), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | if (!str) |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 51 | return -ENOMEM; |
| 52 | data->args.name.len = len; |
| 53 | data->args.name.name = str; |
| 54 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | } |
| 56 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 57 | static void nfs_free_dname(struct nfs_unlinkdata *data) |
| 58 | { |
| 59 | kfree(data->args.name.name); |
| 60 | data->args.name.name = NULL; |
| 61 | data->args.name.len = 0; |
| 62 | } |
| 63 | |
| 64 | static void nfs_dec_sillycount(struct inode *dir) |
| 65 | { |
| 66 | struct nfs_inode *nfsi = NFS_I(dir); |
| 67 | if (atomic_dec_return(&nfsi->silly_count) == 1) |
| 68 | wake_up(&nfsi->waitqueue); |
| 69 | } |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | * nfs_async_unlink_done - Sillydelete post-processing |
| 73 | * @task: rpc_task of the sillydelete |
| 74 | * |
| 75 | * Do the directory attribute update. |
| 76 | */ |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 77 | static void nfs_async_unlink_done(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 79 | struct nfs_unlinkdata *data = calldata; |
| 80 | struct inode *dir = data->dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Trond Myklebust | 70ded20 | 2013-08-21 12:08:45 -0400 | [diff] [blame] | 82 | trace_nfs_sillyrename_unlink(data, task->tk_status); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 83 | if (!NFS_PROTO(dir)->unlink_done(task, dir)) |
Trond Myklebust | d00c5d4 | 2011-10-19 12:17:29 -0700 | [diff] [blame] | 84 | rpc_restart_call_prepare(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | /** |
| 88 | * nfs_async_unlink_release - Release the sillydelete data. |
| 89 | * @task: rpc_task of the sillydelete |
| 90 | * |
| 91 | * We need to call nfs_put_unlinkdata as a 'tk_release' task since the |
| 92 | * rpc_task would be freed too. |
| 93 | */ |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 94 | static void nfs_async_unlink_release(void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 96 | struct nfs_unlinkdata *data = calldata; |
Trond Myklebust | 744d18d | 2008-07-27 18:03:19 -0400 | [diff] [blame] | 97 | struct super_block *sb = data->dir->i_sb; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 98 | |
| 99 | nfs_dec_sillycount(data->dir); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 100 | nfs_free_unlinkdata(data); |
Trond Myklebust | 322b2b9 | 2013-01-11 16:39:51 -0500 | [diff] [blame] | 101 | nfs_sb_deactive(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } |
| 103 | |
Trond Myklebust | 1728017 | 2012-03-11 13:11:00 -0400 | [diff] [blame] | 104 | static void nfs_unlink_prepare(struct rpc_task *task, void *calldata) |
Andy Adamson | 472cfbd | 2009-04-01 09:22:24 -0400 | [diff] [blame] | 105 | { |
| 106 | struct nfs_unlinkdata *data = calldata; |
Bryan Schumaker | 34e137c | 2012-03-19 14:54:41 -0400 | [diff] [blame] | 107 | NFS_PROTO(data->dir)->unlink_rpc_prepare(task, data); |
Andy Adamson | 472cfbd | 2009-04-01 09:22:24 -0400 | [diff] [blame] | 108 | } |
Andy Adamson | 472cfbd | 2009-04-01 09:22:24 -0400 | [diff] [blame] | 109 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 110 | static const struct rpc_call_ops nfs_unlink_ops = { |
| 111 | .rpc_call_done = nfs_async_unlink_done, |
| 112 | .rpc_release = nfs_async_unlink_release, |
Andy Adamson | 472cfbd | 2009-04-01 09:22:24 -0400 | [diff] [blame] | 113 | .rpc_call_prepare = nfs_unlink_prepare, |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 114 | }; |
| 115 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 116 | static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data) |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 117 | { |
Trond Myklebust | 5138fde | 2007-07-14 15:40:01 -0400 | [diff] [blame] | 118 | struct rpc_message msg = { |
| 119 | .rpc_argp = &data->args, |
| 120 | .rpc_resp = &data->res, |
| 121 | .rpc_cred = data->cred, |
| 122 | }; |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 123 | struct rpc_task_setup task_setup_data = { |
Trond Myklebust | 5138fde | 2007-07-14 15:40:01 -0400 | [diff] [blame] | 124 | .rpc_message = &msg, |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 125 | .callback_ops = &nfs_unlink_ops, |
| 126 | .callback_data = data, |
Trond Myklebust | 1daef0a | 2008-07-27 18:19:01 -0400 | [diff] [blame] | 127 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 128 | .flags = RPC_TASK_ASYNC, |
| 129 | }; |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 130 | struct rpc_task *task; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 131 | struct dentry *alias; |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 132 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 133 | alias = d_lookup(parent, &data->args.name); |
| 134 | if (alias != NULL) { |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 135 | int ret; |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 136 | void *devname_garbage = NULL; |
Trond Myklebust | 609005c | 2008-01-28 19:42:59 -0500 | [diff] [blame] | 137 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 138 | /* |
| 139 | * Hey, we raced with lookup... See if we need to transfer |
| 140 | * the sillyrename information to the aliased dentry. |
| 141 | */ |
| 142 | nfs_free_dname(data); |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 143 | ret = nfs_copy_dname(alias, data); |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 144 | spin_lock(&alias->d_lock); |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 145 | if (ret == 0 && alias->d_inode != NULL && |
Trond Myklebust | 609005c | 2008-01-28 19:42:59 -0500 | [diff] [blame] | 146 | !(alias->d_flags & DCACHE_NFSFS_RENAMED)) { |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 147 | devname_garbage = alias->d_fsdata; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 148 | alias->d_fsdata = data; |
Trond Myklebust | fccca7f | 2008-01-26 17:37:47 -0500 | [diff] [blame] | 149 | alias->d_flags |= DCACHE_NFSFS_RENAMED; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 150 | ret = 1; |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 151 | } else |
| 152 | ret = 0; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 153 | spin_unlock(&alias->d_lock); |
| 154 | nfs_dec_sillycount(dir); |
| 155 | dput(alias); |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 156 | /* |
| 157 | * If we'd displaced old cached devname, free it. At that |
| 158 | * point dentry is definitely not a root, so we won't need |
| 159 | * that anymore. |
| 160 | */ |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 161 | kfree(devname_garbage); |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 162 | return ret; |
| 163 | } |
| 164 | data->dir = igrab(dir); |
| 165 | if (!data->dir) { |
| 166 | nfs_dec_sillycount(dir); |
| 167 | return 0; |
| 168 | } |
Trond Myklebust | 1daef0a | 2008-07-27 18:19:01 -0400 | [diff] [blame] | 169 | nfs_sb_active(dir->i_sb); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 170 | data->args.fh = NFS_FH(dir); |
Trond Myklebust | d346890 | 2010-04-16 16:22:50 -0400 | [diff] [blame] | 171 | nfs_fattr_init(data->res.dir_attr); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 172 | |
Trond Myklebust | 5138fde | 2007-07-14 15:40:01 -0400 | [diff] [blame] | 173 | NFS_PROTO(dir)->unlink_setup(&msg, dir); |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 174 | |
Trond Myklebust | 5138fde | 2007-07-14 15:40:01 -0400 | [diff] [blame] | 175 | task_setup_data.rpc_client = NFS_CLIENT(dir); |
Trond Myklebust | c970aa8 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 176 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 177 | if (!IS_ERR(task)) |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 178 | rpc_put_task_async(task); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 179 | return 1; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data) |
| 183 | { |
| 184 | struct dentry *parent; |
| 185 | struct inode *dir; |
| 186 | int ret = 0; |
| 187 | |
| 188 | |
| 189 | parent = dget_parent(dentry); |
| 190 | if (parent == NULL) |
| 191 | goto out_free; |
| 192 | dir = parent->d_inode; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 193 | /* Non-exclusive lock protects against concurrent lookup() calls */ |
| 194 | spin_lock(&dir->i_lock); |
| 195 | if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) { |
| 196 | /* Deferred delete */ |
| 197 | hlist_add_head(&data->list, &NFS_I(dir)->silly_list); |
| 198 | spin_unlock(&dir->i_lock); |
| 199 | ret = 1; |
| 200 | goto out_dput; |
| 201 | } |
| 202 | spin_unlock(&dir->i_lock); |
| 203 | ret = nfs_do_call_unlink(parent, dir, data); |
| 204 | out_dput: |
| 205 | dput(parent); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 206 | out_free: |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 207 | return ret; |
| 208 | } |
| 209 | |
Trond Myklebust | ba6c059 | 2013-08-30 12:24:25 -0400 | [diff] [blame^] | 210 | void nfs_wait_on_sillyrename(struct dentry *dentry) |
| 211 | { |
| 212 | struct nfs_inode *nfsi = NFS_I(dentry->d_inode); |
| 213 | |
| 214 | wait_event(nfsi->waitqueue, atomic_read(&nfsi->silly_count) <= 1); |
| 215 | } |
| 216 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 217 | void nfs_block_sillyrename(struct dentry *dentry) |
| 218 | { |
| 219 | struct nfs_inode *nfsi = NFS_I(dentry->d_inode); |
| 220 | |
| 221 | wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1); |
| 222 | } |
| 223 | |
| 224 | void nfs_unblock_sillyrename(struct dentry *dentry) |
| 225 | { |
| 226 | struct inode *dir = dentry->d_inode; |
| 227 | struct nfs_inode *nfsi = NFS_I(dir); |
| 228 | struct nfs_unlinkdata *data; |
| 229 | |
| 230 | atomic_inc(&nfsi->silly_count); |
| 231 | spin_lock(&dir->i_lock); |
| 232 | while (!hlist_empty(&nfsi->silly_list)) { |
| 233 | if (!atomic_inc_not_zero(&nfsi->silly_count)) |
| 234 | break; |
| 235 | data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list); |
| 236 | hlist_del(&data->list); |
| 237 | spin_unlock(&dir->i_lock); |
| 238 | if (nfs_do_call_unlink(dentry, dir, data) == 0) |
| 239 | nfs_free_unlinkdata(data); |
| 240 | spin_lock(&dir->i_lock); |
| 241 | } |
| 242 | spin_unlock(&dir->i_lock); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 243 | } |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | /** |
| 246 | * nfs_async_unlink - asynchronous unlinking of a file |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 247 | * @dir: parent directory of dentry |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | * @dentry: dentry to unlink |
| 249 | */ |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 250 | static int |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 251 | nfs_async_unlink(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | { |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 253 | struct nfs_unlinkdata *data; |
| 254 | int status = -ENOMEM; |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 255 | void *devname_garbage = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Eric Sesterhenn | bd64754 | 2006-03-20 13:44:10 -0500 | [diff] [blame] | 257 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 258 | if (data == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Trond Myklebust | 98a8e32 | 2008-03-12 12:25:28 -0400 | [diff] [blame] | 261 | data->cred = rpc_lookup_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | if (IS_ERR(data->cred)) { |
| 263 | status = PTR_ERR(data->cred); |
| 264 | goto out_free; |
| 265 | } |
Trond Myklebust | d346890 | 2010-04-16 16:22:50 -0400 | [diff] [blame] | 266 | data->res.dir_attr = &data->dir_attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 268 | status = -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | spin_lock(&dentry->d_lock); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 270 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| 271 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 273 | devname_garbage = dentry->d_fsdata; |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 274 | dentry->d_fsdata = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | spin_unlock(&dentry->d_lock); |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 276 | /* |
| 277 | * If we'd displaced old cached devname, free it. At that |
| 278 | * point dentry is definitely not a root, so we won't need |
| 279 | * that anymore. |
| 280 | */ |
Tim Gardner | 96aa154 | 2013-02-12 13:03:42 -0700 | [diff] [blame] | 281 | kfree(devname_garbage); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 282 | return 0; |
| 283 | out_unlock: |
| 284 | spin_unlock(&dentry->d_lock); |
| 285 | put_rpccred(data->cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | out_free: |
| 287 | kfree(data); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 288 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | return status; |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * nfs_complete_unlink - Initialize completion of the sillydelete |
| 294 | * @dentry: dentry to delete |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 295 | * @inode: inode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | * |
| 297 | * Since we're most likely to be called by dentry_iput(), we |
| 298 | * only use the dentry to find the sillydelete. We then copy the name |
| 299 | * into the qstr. |
| 300 | */ |
| 301 | void |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 302 | nfs_complete_unlink(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 304 | struct nfs_unlinkdata *data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | spin_lock(&dentry->d_lock); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 307 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 308 | dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; |
| 309 | data = dentry->d_fsdata; |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 310 | dentry->d_fsdata = NULL; |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 311 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | spin_unlock(&dentry->d_lock); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 313 | |
| 314 | if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data))) |
| 315 | nfs_free_unlinkdata(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 317 | |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 318 | /* Cancel a queued async unlink. Called when a sillyrename run fails. */ |
| 319 | static void |
| 320 | nfs_cancel_async_unlink(struct dentry *dentry) |
| 321 | { |
| 322 | spin_lock(&dentry->d_lock); |
| 323 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 324 | struct nfs_unlinkdata *data = dentry->d_fsdata; |
| 325 | |
| 326 | dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; |
Al Viro | b1942c5 | 2011-03-16 05:44:14 -0400 | [diff] [blame] | 327 | dentry->d_fsdata = NULL; |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 328 | spin_unlock(&dentry->d_lock); |
| 329 | nfs_free_unlinkdata(data); |
| 330 | return; |
| 331 | } |
| 332 | spin_unlock(&dentry->d_lock); |
| 333 | } |
| 334 | |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 335 | /** |
| 336 | * nfs_async_rename_done - Sillyrename post-processing |
| 337 | * @task: rpc_task of the sillyrename |
| 338 | * @calldata: nfs_renamedata for the sillyrename |
| 339 | * |
| 340 | * Do the directory attribute updates and the d_move |
| 341 | */ |
| 342 | static void nfs_async_rename_done(struct rpc_task *task, void *calldata) |
| 343 | { |
| 344 | struct nfs_renamedata *data = calldata; |
| 345 | struct inode *old_dir = data->old_dir; |
| 346 | struct inode *new_dir = data->new_dir; |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 347 | struct dentry *old_dentry = data->old_dentry; |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 348 | |
Trond Myklebust | 70ded20 | 2013-08-21 12:08:45 -0400 | [diff] [blame] | 349 | trace_nfs_sillyrename_rename(old_dir, old_dentry, |
| 350 | new_dir, data->new_dentry, task->tk_status); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 351 | if (!NFS_PROTO(old_dir)->rename_done(task, old_dir, new_dir)) { |
Trond Myklebust | d00c5d4 | 2011-10-19 12:17:29 -0700 | [diff] [blame] | 352 | rpc_restart_call_prepare(task); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 353 | return; |
| 354 | } |
| 355 | |
Trond Myklebust | 5a7a613 | 2013-02-22 12:53:43 -0500 | [diff] [blame] | 356 | if (task->tk_status != 0) |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 357 | nfs_cancel_async_unlink(old_dentry); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | /** |
| 361 | * nfs_async_rename_release - Release the sillyrename data. |
| 362 | * @calldata: the struct nfs_renamedata to be released |
| 363 | */ |
| 364 | static void nfs_async_rename_release(void *calldata) |
| 365 | { |
| 366 | struct nfs_renamedata *data = calldata; |
| 367 | struct super_block *sb = data->old_dir->i_sb; |
| 368 | |
| 369 | if (data->old_dentry->d_inode) |
| 370 | nfs_mark_for_revalidate(data->old_dentry->d_inode); |
| 371 | |
| 372 | dput(data->old_dentry); |
| 373 | dput(data->new_dentry); |
| 374 | iput(data->old_dir); |
| 375 | iput(data->new_dir); |
| 376 | nfs_sb_deactive(sb); |
| 377 | put_rpccred(data->cred); |
| 378 | kfree(data); |
| 379 | } |
| 380 | |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 381 | static void nfs_rename_prepare(struct rpc_task *task, void *calldata) |
| 382 | { |
| 383 | struct nfs_renamedata *data = calldata; |
Bryan Schumaker | c6bfa1a | 2012-03-19 14:54:42 -0400 | [diff] [blame] | 384 | NFS_PROTO(data->old_dir)->rename_rpc_prepare(task, data); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 385 | } |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 386 | |
| 387 | static const struct rpc_call_ops nfs_rename_ops = { |
| 388 | .rpc_call_done = nfs_async_rename_done, |
| 389 | .rpc_release = nfs_async_rename_release, |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 390 | .rpc_call_prepare = nfs_rename_prepare, |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 391 | }; |
| 392 | |
| 393 | /** |
| 394 | * nfs_async_rename - perform an asynchronous rename operation |
| 395 | * @old_dir: directory that currently holds the dentry to be renamed |
| 396 | * @new_dir: target directory for the rename |
| 397 | * @old_dentry: original dentry to be renamed |
| 398 | * @new_dentry: dentry to which the old_dentry should be renamed |
| 399 | * |
| 400 | * It's expected that valid references to the dentries and inodes are held |
| 401 | */ |
| 402 | static struct rpc_task * |
| 403 | nfs_async_rename(struct inode *old_dir, struct inode *new_dir, |
| 404 | struct dentry *old_dentry, struct dentry *new_dentry) |
| 405 | { |
| 406 | struct nfs_renamedata *data; |
| 407 | struct rpc_message msg = { }; |
| 408 | struct rpc_task_setup task_setup_data = { |
| 409 | .rpc_message = &msg, |
| 410 | .callback_ops = &nfs_rename_ops, |
| 411 | .workqueue = nfsiod_workqueue, |
| 412 | .rpc_client = NFS_CLIENT(old_dir), |
| 413 | .flags = RPC_TASK_ASYNC, |
| 414 | }; |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 415 | |
Benny Halevy | dfb4f309 | 2010-09-24 09:17:01 -0400 | [diff] [blame] | 416 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 417 | if (data == NULL) |
| 418 | return ERR_PTR(-ENOMEM); |
Trond Myklebust | 1174dd1 | 2010-12-21 10:52:24 -0500 | [diff] [blame] | 419 | task_setup_data.callback_data = data; |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 420 | |
| 421 | data->cred = rpc_lookup_cred(); |
| 422 | if (IS_ERR(data->cred)) { |
Trond Myklebust | f7732d6 | 2010-09-21 16:52:40 -0400 | [diff] [blame] | 423 | struct rpc_task *task = ERR_CAST(data->cred); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 424 | kfree(data); |
| 425 | return task; |
| 426 | } |
| 427 | |
| 428 | msg.rpc_argp = &data->args; |
| 429 | msg.rpc_resp = &data->res; |
| 430 | msg.rpc_cred = data->cred; |
| 431 | |
| 432 | /* set up nfs_renamedata */ |
| 433 | data->old_dir = old_dir; |
Al Viro | a4118ee | 2010-10-27 11:00:08 -0400 | [diff] [blame] | 434 | ihold(old_dir); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 435 | data->new_dir = new_dir; |
Al Viro | a4118ee | 2010-10-27 11:00:08 -0400 | [diff] [blame] | 436 | ihold(new_dir); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 437 | data->old_dentry = dget(old_dentry); |
| 438 | data->new_dentry = dget(new_dentry); |
| 439 | nfs_fattr_init(&data->old_fattr); |
| 440 | nfs_fattr_init(&data->new_fattr); |
| 441 | |
| 442 | /* set up nfs_renameargs */ |
| 443 | data->args.old_dir = NFS_FH(old_dir); |
| 444 | data->args.old_name = &old_dentry->d_name; |
| 445 | data->args.new_dir = NFS_FH(new_dir); |
| 446 | data->args.new_name = &new_dentry->d_name; |
| 447 | |
| 448 | /* set up nfs_renameres */ |
| 449 | data->res.old_fattr = &data->old_fattr; |
| 450 | data->res.new_fattr = &data->new_fattr; |
| 451 | |
| 452 | nfs_sb_active(old_dir->i_sb); |
| 453 | |
| 454 | NFS_PROTO(data->old_dir)->rename_setup(&msg, old_dir); |
| 455 | |
Trond Myklebust | f7732d6 | 2010-09-21 16:52:40 -0400 | [diff] [blame] | 456 | return rpc_run_task(&task_setup_data); |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 457 | } |
| 458 | |
Trond Myklebust | c2dd137 | 2013-08-21 19:54:08 -0400 | [diff] [blame] | 459 | #define SILLYNAME_PREFIX ".nfs" |
| 460 | #define SILLYNAME_PREFIX_LEN ((unsigned)sizeof(SILLYNAME_PREFIX) - 1) |
| 461 | #define SILLYNAME_FILEID_LEN ((unsigned)sizeof(u64) << 1) |
| 462 | #define SILLYNAME_COUNTER_LEN ((unsigned)sizeof(unsigned int) << 1) |
| 463 | #define SILLYNAME_LEN (SILLYNAME_PREFIX_LEN + \ |
| 464 | SILLYNAME_FILEID_LEN + \ |
| 465 | SILLYNAME_COUNTER_LEN) |
| 466 | |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 467 | /** |
| 468 | * nfs_sillyrename - Perform a silly-rename of a dentry |
| 469 | * @dir: inode of directory that contains dentry |
| 470 | * @dentry: dentry to be sillyrenamed |
| 471 | * |
| 472 | * NFSv2/3 is stateless and the server doesn't know when the client is |
| 473 | * holding a file open. To prevent application problems when a file is |
| 474 | * unlinked while it's still open, the client performs a "silly-rename". |
| 475 | * That is, it renames the file to a hidden file in the same directory, |
| 476 | * and only performs the unlink once the last reference to it is put. |
| 477 | * |
| 478 | * The final cleanup is done during dentry_iput. |
J. Bruce Fields | 674e405 | 2011-07-15 19:09:08 -0400 | [diff] [blame] | 479 | * |
| 480 | * (Note: NFSv4 is stateful, and has opens, so in theory an NFSv4 server |
| 481 | * could take responsibility for keeping open files referenced. The server |
| 482 | * would also need to ensure that opened-but-deleted files were kept over |
| 483 | * reboots. However, we may not assume a server does so. (RFC 5661 |
| 484 | * does provide an OPEN4_RESULT_PRESERVE_UNLINKED flag that a server can |
| 485 | * use to advertise that it does this; some day we may take advantage of |
| 486 | * it.)) |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 487 | */ |
| 488 | int |
| 489 | nfs_sillyrename(struct inode *dir, struct dentry *dentry) |
| 490 | { |
| 491 | static unsigned int sillycounter; |
Trond Myklebust | c2dd137 | 2013-08-21 19:54:08 -0400 | [diff] [blame] | 492 | unsigned char silly[SILLYNAME_LEN + 1]; |
| 493 | unsigned long long fileid; |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 494 | struct dentry *sdentry; |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 495 | struct rpc_task *task; |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 496 | int error = -EIO; |
| 497 | |
| 498 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", |
| 499 | dentry->d_parent->d_name.name, dentry->d_name.name, |
Al Viro | 84d08fa | 2013-07-05 18:59:33 +0400 | [diff] [blame] | 500 | d_count(dentry)); |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 501 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
| 502 | |
| 503 | /* |
| 504 | * We don't allow a dentry to be silly-renamed twice. |
| 505 | */ |
| 506 | error = -EBUSY; |
| 507 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| 508 | goto out; |
| 509 | |
Trond Myklebust | c2dd137 | 2013-08-21 19:54:08 -0400 | [diff] [blame] | 510 | fileid = NFS_FILEID(dentry->d_inode); |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 511 | |
| 512 | /* Return delegation in anticipation of the rename */ |
Bryan Schumaker | 57ec14c | 2012-06-20 15:53:44 -0400 | [diff] [blame] | 513 | NFS_PROTO(dentry->d_inode)->return_delegation(dentry->d_inode); |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 514 | |
| 515 | sdentry = NULL; |
| 516 | do { |
Trond Myklebust | c2dd137 | 2013-08-21 19:54:08 -0400 | [diff] [blame] | 517 | int slen; |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 518 | dput(sdentry); |
| 519 | sillycounter++; |
Trond Myklebust | c2dd137 | 2013-08-21 19:54:08 -0400 | [diff] [blame] | 520 | slen = scnprintf(silly, sizeof(silly), |
| 521 | SILLYNAME_PREFIX "%0*llx%0*x", |
| 522 | SILLYNAME_FILEID_LEN, fileid, |
| 523 | SILLYNAME_COUNTER_LEN, sillycounter); |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 524 | |
| 525 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", |
| 526 | dentry->d_name.name, silly); |
| 527 | |
| 528 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); |
| 529 | /* |
| 530 | * N.B. Better to return EBUSY here ... it could be |
| 531 | * dangerous to delete the file while it's in use. |
| 532 | */ |
| 533 | if (IS_ERR(sdentry)) |
| 534 | goto out; |
| 535 | } while (sdentry->d_inode != NULL); /* need negative lookup */ |
| 536 | |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 537 | /* queue unlink first. Can't do this from rpc_release as it |
| 538 | * has to allocate memory |
| 539 | */ |
| 540 | error = nfs_async_unlink(dir, dentry); |
| 541 | if (error) |
| 542 | goto out_dput; |
| 543 | |
Jeff Layton | 73ca100 | 2011-07-18 11:26:30 -0400 | [diff] [blame] | 544 | /* populate unlinkdata with the right dname */ |
| 545 | error = nfs_copy_dname(sdentry, |
| 546 | (struct nfs_unlinkdata *)dentry->d_fsdata); |
| 547 | if (error) { |
| 548 | nfs_cancel_async_unlink(dentry); |
| 549 | goto out_dput; |
| 550 | } |
| 551 | |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 552 | /* run the rename task, undo unlink if it fails */ |
| 553 | task = nfs_async_rename(dir, dir, dentry, sdentry); |
| 554 | if (IS_ERR(task)) { |
| 555 | error = -EBUSY; |
| 556 | nfs_cancel_async_unlink(dentry); |
| 557 | goto out_dput; |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 558 | } |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 559 | |
| 560 | /* wait for the RPC task to complete, unless a SIGKILL intervenes */ |
| 561 | error = rpc_wait_for_completion_task(task); |
| 562 | if (error == 0) |
| 563 | error = task->tk_status; |
Trond Myklebust | 5a7a613 | 2013-02-22 12:53:43 -0500 | [diff] [blame] | 564 | switch (error) { |
| 565 | case 0: |
| 566 | /* The rename succeeded */ |
| 567 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 568 | d_move(dentry, sdentry); |
| 569 | break; |
| 570 | case -ERESTARTSYS: |
| 571 | /* The result of the rename is unknown. Play it safe by |
| 572 | * forcing a new lookup */ |
| 573 | d_drop(dentry); |
| 574 | d_drop(sdentry); |
| 575 | } |
Jeff Layton | d3d4152 | 2010-09-17 17:31:57 -0400 | [diff] [blame] | 576 | rpc_put_task(task); |
| 577 | out_dput: |
Jeff Layton | 779c517 | 2010-09-17 17:31:30 -0400 | [diff] [blame] | 578 | dput(sdentry); |
| 579 | out: |
| 580 | return error; |
| 581 | } |